The Latest: Airstrikes hit Syria's Aleppo after 3-week pause

Syrian opposition activists say airstrikes have hit rebel-held eastern Aleppo for the first time in three weeks, fearing it could signal the start of a new government offensive in the northern city.

The Britain-based Syrian Observatory for Human Rights says Tuesday's airstrikes struck three neighborhoods. It had no immediate word on casualties.

Activist Baraa al-Halaby, who is based in eastern Aleppo, says via text messages that warplanes are firing missiles and helicopters are dropping barrel bombs on the eastern part of Syria's largest city.

In mid-October, Russia said it would halt airstrikes to allow rebels and supporters to leave eastern Aleppo. The rebels refused to take up the offer and the United Nations failed to negotiate the delivery of aid into the besieged area.

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Two U.N. agencies say food production in Syria has shrunk to "an all-time low," threatening to drive more people from their homes after 5-1/2 years of war.

The World Food Program and the Food and Agricultural Organization say factors like rising prices, poor weather, general instability and the lack of fertilizer and seeds could force some farmers to stop producing.

A joint report released Tuesday says the planting area in the 2015-2016 season was the smallest ever in zones controlled by the government, ethnic Kurds and the armed opposition. WFP spokeswoman Bettina Luescher said information was lacking about areas controlled by the radical Islamic State group.